177,894 research outputs found
Camp Century: Firn compaction measurements (CEN-COM)
No full textFirn compaction measurements at Camp Century (CEN-COM)
Contact:
Baptiste Vandecrux ([email protected])
Please cite the following study when using these data:
Vandecrux, B., Colgan, W., Solgaard, A.M., Steffensen, J.P., and Karlsson, N.B.(2021). Firn evolution at Camp Century, Greenland: 1966-2100, Frontiers in Earth Science, https://doi.org/10.3389/feart.2021.578978, 2021
Location:
77.18N -61.11E 1886 m a.s.l
Temporal coverage: 2017-08-01 to 2020-01-19
Temporal resolution: daily snapshots
Instrument design:
The instrument were designed by Mike MacFerrin ([email protected]) after “coffee-can” method (Hulbe and Whillans, 1994; Hamilton et al., 1998) to continuously monitor firn compaction, similar to the method used by Arthern et al. (2010). Each instrument is composed of a line with a weight attached to one end and connected to a spring-loaded potentiometer on the other end. The weight is anchored at the bottom of a borehole, and the potentiometer is placed at the top of the borehole. As the borehole shortens due to firn compaction, the potentiometer reels in the string to maintain tension, and a data logger records the length of string that has been reeled in.
The CEN-COM station was first introduced by Colgan et al. (2018) and then described and used in Vandecrux et al. (2021). Please consider citing these two studies if using this data.
References:
Arthern, R.J., Vaughan, D.G., Rankin, A.M., Mulvaney, R., and Thomas, E.R. (2010). In situ measurements of Antarctic snow compaction compared with predictions of models. J. Geophys. Res. 115, 12 PP.
Colgan, W., Pedersen, A., Binder, D., Machguth, H., Abermann, J., and Jayred, M. (2018). Initial field activities of the camp century climate monitoring programme in Greenland. Geol. Surv. of Denmark Greenland Bull. 41, 75–78. doi:10.34194/geusb.v41.4347
Hamilton, G.S., and Whillans, I.M. (2002). Local rates of ice-sheet thickness change in Greenland. Ann. Glaciol. 35, 79–83.
Hulbe, C., & Whillans, I. (1994). A method for determining ice-thickness change at remote locations using GPS. Annals of Glaciology, 20, 263-268. doi:10.3189/1994AoG20-1-263-268
Vandecrux, B., Colgan, W., Solgaard, A.M., Steffensen, J.P., and Karlsson, N.B.(2021). Firn evolution at Camp Century, Greenland: 1966-2100, Frontiers in Earth Science, https://doi.org/10.3389/feart.2021.578978, 2021
Instrumental set up:
On 1st of August 2017, three instruments were installed:
Instrument #1: Top at 1.4 m depth, end of line at 62.3 m depth
Instrument #2: Top at 0.0 m depth, end of line at 20.0 m depth
Instrument #3: Top at 0.0m depth, end of line at 5.0 m depth
On the 16th of May 2019, these three intruments were unplugged and two new instruments were inserted:
Instrument #1: Top at 0.0 m depth, end of line at 4.9 m depth (+/- 0.2 m)
Instrument #2: Top at 0.0 m depth, end of line at 7.7 m depth (+/- 0.2 m)
Instrument #5 failed and did not record any data.
Field operators: Liam Colgan, Robert S. Fausto, Allan Ø. Pedersen
Data description:
This folder contains transmissions from the station modem.
The three useful columns are the last three: "INST_1_LENGTH_CORRECTED_M" (and INST_2, INST_3, respectively). This shows the length of the 2-m potentiometer cable over time.
To derive borehole length from these measurements, do this:
INIT_BOREHOLE_LEN = depth (m) of the borehole when it was first drilled at the instrument installed.
INIT_CABLE_LEN = length of the cable (m) at the first full day after the instrument was installed (can check your field notes, or just plot & look at the data to see when the trends begin), from the table
CURRENT_CABLE_LEN = length of the cable (m) on any subsequent day
CURRENT_BOREHOLE_LEN = length of the borehole (m) on any subsequent day
Calculate as such:
CURRENT_BOREHOLE_LEN = INIT_BOREHOLE_LEN - INIT_CABLE_LEN + CURRENT_CABLE_LEN
The first weeks of measurements can be affected by the initial settling of the instrument into the snow.<br
Richmondaropa conjuncta Shea & Colgan & Stanisic 2012, n. comb.
No full textRichmondaropa conjuncta (Iredale, 1941) n. comb. (Figs 30D, E; 32D, E; 34D, E; 36D, E; 38C, D) Roblinella conjuncta Iredale, 1941b: 1; Iredale 1941a: 268 (illustration only). Roblinella conjuncta: Smith 1992: 203. Gyrocochlea conjuncta (Iredale): Stanisic et al. 2010: 200. Type locality. Byron Bay, NSW. Diagnosis. Shell very small, cinnamon brown, planispiral with flat to slightly depressed spire. Protoconch sculpture primarily spiral consisting of 17 prominent, widely spaced, narrow, continuous spiral cords; underlying weak radial ridges present. Teleoconch sculpture of numerous, prominent, quite uniformly spaced, slightly sinuate, orthocline to weakly prosocline radial ribs. Ribs on body whorl 67–100 (mean 77). Umbilicus wide U-shaped to cup-shaped. Type material examined. Neotype (here designated) AM C.5311, Byron Bay, NSW (28° 39' S, 153° 37' E), 1908. Other material examined. Byron Bay: AM C.140243, AM C.472888. Brunswick Heads: QMMO 16789. Description. Shell very small, cinnamon-brown, planispiral with flat to slightly depressed spire. Whorls 3.50–4.25, tightly coiled, the last weakly expanding and strongly descending in front. Sutures strongly impressed. Shell diameter 3.46–4.04 mm (mean 3.74 mm), height 1.81–2.26 mm (mean 2.08 mm), H/D 0.50–0.59 (mean 0.55). Protoconch flat, of 1.12 whorls, diameter 0.56–0.67 mm. Protoconch sculpture primarily spiral consisting of 17 prominent, widely spaced, narrow, continuous spiral cords; underlying weak radial ridges present. Teleoconch sculpture of numerous, prominent, quite uniformly spaced, slightly sinuate, orthocline to weakly prosocline radial ribs. Ribs on body whorl 67–100 (mean 77), width of interstices on the first teleoconch whorl greater than or equal to width of six ribs; on the penultimate whorl greater than or equal to width of six ribs; each rib with one or more periostracal blades; with or without overlapping thickenings. Interstitial sculpture of low prominent microradial ribs and low, weaker microspiral cords forming weak beads at their intersection; number of microradials between ribs on the first teleoconch whorl 5–8; on first quarter of body whorl 13–17. Aperture broadly ovately-lunate. Parietal callus prominent, transparent. Umbilicus wide U-shaped to cup-shaped, diameter 0.80–1.16 mm (mean 0.99 mm), D/U 3.32–4.36 (mean 3.79). Based on 11 measured adults. Anatomy unknown. Distribution and habitat. Coastally in the Byron Bay region, north-eastern NSW; found in rainforest and vine thicket; living on underside of logs. Remarks. Iredale (1941) did not provide details about the protoconch of the type of Richmondaropa conjuncta n. comb. when he described the species. The type cannot now be located so that the protoconch sculpture cannot be determined. However, by assigning the species to Roblinella Iredale, 1937 (type: Helix roblini Petterd, 1879) Iredale identified this species as having a primarily spiral protoconch (see note below). Additionally, the comparatively low rib count for the body whorl (approx. 80) given by Iredale (1941b) is distinctive among the nautiliform charopids of north-eastern NSW. The illustration of the species, provided by that author in a publication (Iredale 1941a) preceding that in which the original description appeared (Iredale 1941b), clearly shows the wide rib spacing on the body whorl. Contemporary collections from the coastal rainforests around the Byron Bay area have discovered specimens which align quite closely with Iredale’s description. Hence, in order to stabilise this name a neotype is here designated from this recently collected material. R. conjuncta differs from R. prava by having more tightly coiled whorls and fewer, more widely spaced radial ribs on the teleoconch. This species may only be a regional variant of R. prava, however without DNA results and soft parts to study, full species status is retained pending further study. A second large undescribed planispiral charopid occurs sympatrically with R. conjuncta distinguished by more crowded teleoconch ribs, shallower whorls, wider umbilicus and a cancellate protoconch not dissimilar to ‘Gyrocochlea’ species. A specimen identified as R. conjuncta from the Byron Bay-Brunswick Heads road in the Queensland Museum collections had a higher teleoconch rib count (100), compared to other specimens from the Byron Bay area (up to 90). It is here included with R. conjuncta based on its proximity to the Byron Bay site but may in fact be R. prava. Note. Four species from Tasmania (H. agnewi Legrand, 1871, H. curacoae Brazier, 1871, H. mathinnae Petterd, 1879, H. gadenensis Petterd, 1879), one from South Australia (R. speranda Iredale, 1937) and Endodonta intermedia Odhner, 1917 from the Atherton Tableland, north-eastern Queensland, were originally placed in Roblinella by Iredale (1937) on the basis of spirally lirate protoconch sculpture. Subsequently, R. conjuncta Iredale, 1941 from Northern New South Wales was also assigned to this genus. Stanisic et al. (2010) reassigned R. intermedia to Sinployea Solem, 1983. Here we have assigned R. conjuncta to Richmondaropa n. gen. Detailed examination of the micro-architecture of the protoconchs of the remaining Tasmanian representatives indicates that Roblinella still remains a polyphyletic taxon requiring revision (J. Stanisic unpublished data).Published as part of Shea, M., Colgan, D. J. & Stanisic, J., 2012, 3585, pp. 1-109 in Zootaxa 3585 on pages 83-8
The XYZ Bank: A Case Discussion
No full textIn early May, 1974, Mike Hart, the Check Collection Department Head for the XYZ Bank asked Sid Collins, the Check Processing Section Head to meet with him regarding several problems which had begun to surface in the Department. Hart was concerned with the pressure he had been getting from members of senior management regarding the performance and efficiency of the Department and he wanted to prepare a response to these questions.ProQuest Traditional Publishing Optio
Richmondaropa prava Shea & Colgan & Stanisic 2012, n. comb.
No full textRichmondaropa prava (Hedley, 1924) n. comb. (Figs 30B, C; 32B. C; 34B, C; 36B, C; 38A, B; 39F, G; 40F; 41E, F) Gyrocochlea prava Hedley, 1924: 217. Gyrocochlea prava: Iredale 1937: 323; Iredale 1941a: 268; Smith 1992: 191; Stanisic et al. 2010: 200. Diagnosis. Shell very small, cinnamon brown, biconcave with weakly depressed spire. Protoconch sculpture primarily spiral consisting of 21 prominent, widely spaced, narrow, continuous spiral cords; vague, very weak, underlying radial ridges present. Teleoconch sculpture of numerous, prominent, quite uniformly spaced, slightly sinuate, strongly prosocline radial ribs. Ribs on body whorl 100–117 (mean 104). Umbilicus wide U-shaped to cupshaped. Epiphallus longer than penis, entering penis through a simple pore (verge absent). Penis tubular with an expanded apical portion, internally with 2–3 longitudinal pilasters. Type material examined. Holotype. AM C63491, Upper Tweed River, NSW, coll. W. Petterd. Paratypes. AM C.103621, same data as holotype. Other material examined. NSW-Booyong Nature Reserve: AM C.140225, QMMO 17066. Richmond Range: QMMO 6273, QMMO 10909/ AM C.128499, QMMO 49123. Stotts Island: QMMO 10517, QMMO 78719. Lismore: QMMO 19824, QMMO 77015. Qld-Currumbin Valley: AM C.339711. Description. Shell very small, cinnamon brown, biconcave with weakly depressed spire. Whorls 3.62–4.5 (mean 4.00), tightly coiled, the last weakly expanding and strongly descending in front. Sutures strongly impressed. Shell diameter 3.59–3.93 mm (mean 3.77 mm), height 1.99–2.17 mm (mean 2.09 mm), H/D 0.48–0.77 (mean 0.55). Protoconch flat, of 1.12 whorls, diameter 0.56–0.67 mm. Protoconch sculpture primarily spiral consisting of 21 prominent, widely spaced, narrow, continuous spiral cords; underlying weak radial ridges present. Teleoconch sculpture of numerous, prominent, quite uniformly spaced, slightly sinuate, strongly prosocline radial ribs. Ribs on body whorl 100–117 (mean 104), width of interstices on the first teleoconch whorl equal to width of four to greater than or equal to width of six ribs; on the penultimate whorl equal to width of four to equal to width of six ribs; each rib with single periostracal blade. Interstitial sculpture of low prominent microradial ribs and low, weaker microspiral cords forming weak beads at their intersection; number of microradials between ribs on the first teleoconch whorl 5–8; on first quarter of body whorl 9–10. Aperture broadly ovately-lunate. Parietal callus prominent, transparent. Umbilicus wide U shaped to cup-shaped, diameter 0.82–1.32 mm (mean 1.04 mm), D/U 2.65–4.40 (mean 3.56). Based on 25 measured adults. Reproductive tract with ovotestis containing two clumps of alveoli, with more than two alveolar lobes per clump. Hermaphroditic duct corrugated, crescent-shaped. Spermatheca with a medium-sized circular bulb. Penial retractor muscle inserting on top of penis at the junction of the penis and epiphallus. Epiphallus longer than penis, entering penis through a simple pore (i.e. verge absent). Penis tubular with an expanded apical portion, internally with 2–3 longitudinal pilasters. Vagina shorter than penis. Atrium short. Distribution and habitat. Richmond River to the Border Ranges, north-eastern NSW; found in lowland to mid-altitude rainforest and vine thicket, living under logs. Remarks: Richmondaropa prava (Hedley, 1924) n. comb. is distinguished from the more coastal and parapatric Richmondaropa conjuncta (Iredale, 1941) n. comb. by its larger size, less tightly coiled whorls and more crowded and numerous radial ribs on the teleoconch. R. prava differs from the broadly sympatric Dictyoropa eurythma chiefly by the protoconch sculpture which in R. prava primarily consists of widely spaced, narrow spiral cords in contrast to the broadly reticulate pattern of D. eurythma. Radial elements are present on the protoconch of R. prava but these take the form of weak underlying growth ridges.Published as part of Shea, M., Colgan, D. J. & Stanisic, J., 2012, 3585, pp. 1-109 in Zootaxa 3585 on pages 82-8
A Short treatise on the antiquity, institution, excellency, indulgences, privileges, etc., of the ancient Confraternity of Our Blessed Lady of Mount Carmel, called, the Scapular : with a brief account of the designs, rules, and conditions thereof ; with a novena in honor of the Immaculate Virgin /
No full textAppendix, 36 p. at end, has individual t.p.: Meditations and prayers adapted to the Stations of the Holy Way of the Cross. Philadelphia : Thos. P. Colgan.Mode of access: Internet
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Modern Airline Pilots\u27 Quandary: Standard Operating Procedures—to Comply or Not to Comply
No full textModern airline pilots are tasked every flight with the safe and efficient operation of highly automated airliners in today’s complicated global and economic environments. Airlines have developed standard operating procedures (SOP) for normal, abnormal, and emergency operations. These procedures serve as a script for crews to follow. These procedures are designed by airlines to ensure that aircraft are operated in the (1) most safe, (2) most efficient, and (3) most on-time manner. For the most part pilots will comply with SOP, but when they (1) don9t agree with SOP, (2) don9t understand SOP or the risks associated with not complying with SOP, or (3) don9t feel adequately trained to know what SOP is, it is difficult to motivate them to comply. Airlines have the means to measure compliance through Flight Operations Quality Assurance (FOQA) and Line Operations Safety Audit (LOSA). The purpose of this research is to determine if increased understanding, knowledge and awareness of the risk of noncompliance with SOP increase airline pilots’ compliance with SOP. This research explores data from line checks at a major US airline that was gathered in pursuit of understanding what drives SOP compliance. Baseline data was gathered and analyzed to determine the top 12 noncompliant items. The airline provided training during the Human Factors module in each pilots recurrent training on Pilot Intentional Non Compliance (PINC). The training including developing pilots’ understanding that while most Aviation Safety Action Program (ASAP) reports grant pilots immunity from legal action, if a violation is labeled PINC, ASAP protections do not apply. Further line checks were conducted after the pilots received the PINC training. The top 12 noncompliant items from the pre-PINC training group were compared to the same 12 items in the post-PINC training group. Significant improvement in SOP compliance was found in six of the 12 items tested. The results established that training pilots on the risk of PINC did significantly increase SOP compliance
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